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<div class="refentry">
<a name="boost.proto.expr"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2><span class="refentrytitle">Struct template expr</span></h2>
<p>boost::proto::expr — Representation of a node in an expression tree.</p>
</div>
<h2 class="refsynopsisdiv-title">Synopsis</h2>
<div class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../proto/reference.html#header.boost.proto.expr_hpp" title="Header &lt;boost/proto/expr.hpp&gt;">boost/proto/expr.hpp</a>&gt;

</span><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Tag<span class="special">,</span> <span class="keyword">typename</span> Args<span class="special">,</span> <span class="keyword">long</span> Arity <span class="special">=</span> <span class="identifier">Args</span><span class="special">::</span><span class="identifier">arity</span><span class="special">&gt;</span> 
<span class="keyword">struct</span> <a class="link" href="expr.html" title="Struct template expr">expr</a> <span class="special">{</span>
  <span class="comment">// types</span>
  <span class="keyword">typedef</span> <span class="identifier">Tag</span>                                   <a name="boost.proto.expr.proto_tag"></a><span class="identifier">proto_tag</span><span class="special">;</span>         
  <span class="keyword">typedef</span> <span class="identifier">Args</span>                                  <a name="boost.proto.expr.proto_args"></a><span class="identifier">proto_args</span><span class="special">;</span>        
  <span class="keyword">typedef</span> <span class="identifier">mpl</span><span class="special">::</span><span class="identifier">long_</span><span class="special">&lt;</span> <span class="identifier">Arity</span> <span class="special">&gt;</span>                   <a name="boost.proto.expr.proto_arity"></a><span class="identifier">proto_arity</span><span class="special">;</span>       
  <span class="keyword">typedef</span> <a class="link" href="default_domain.html" title="Struct default_domain">proto::default_domain</a>                 <a name="boost.proto.expr.proto_domain"></a><span class="identifier">proto_domain</span><span class="special">;</span>      
  <span class="keyword">typedef</span> <a class="link" href="basic_expr.html" title="Struct template basic_expr">proto::basic_expr</a><span class="special">&lt;</span> <span class="identifier">Tag</span><span class="special">,</span> <span class="identifier">Args</span><span class="special">,</span> <span class="identifier">Arity</span> <span class="special">&gt;</span> <a name="boost.proto.expr.proto_grammar"></a><span class="identifier">proto_grammar</span><span class="special">;</span>     
  <span class="keyword">typedef</span> <span class="identifier">expr</span>                                  <a name="boost.proto.expr.proto_base_expr"></a><span class="identifier">proto_base_expr</span><span class="special">;</span>   
  <span class="keyword">typedef</span> <span class="identifier">expr</span>                                  <a name="boost.proto.expr.proto_derived_expr"></a><span class="identifier">proto_derived_expr</span><span class="special">;</span>
  <span class="keyword">typedef</span> <span class="keyword">typename</span> <span class="identifier">Args</span><span class="special">::</span><span class="identifier">child</span><em class="replaceable"><code><span class="identifier">N</span></code></em>                 <a name="boost.proto.expr.proto_childN"></a><span class="identifier">proto_childN</span><span class="special">;</span>        <span class="comment">// For each <em class="replaceable"><code>N</code></em> in <em class="replaceable"><code>[0,max(Arity,1))</code></em>.</span>

  <span class="comment">// member classes/structs/unions</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> Signature<span class="special">&gt;</span> 
  <span class="keyword">struct</span> <a class="link" href="expr/result.html" title="Struct template result">result</a> <span class="special">{</span>
    <span class="comment">// types</span>
    <span class="keyword">typedef</span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a class="link" href="expr/result.html#boost.proto.expr.result.type"><span class="identifier">type</span></a><span class="special">;</span>
  <span class="special">}</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="expr.html#id-1_3_32_5_9_1_1_2_13-bb">public static functions</a></span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span><span class="special">...</span> A<span class="special">&gt;</span> <span class="keyword">static</span> <span class="identifier">expr</span> <span class="keyword">const</span> <a class="link" href="expr.html#id-1_3_32_5_9_1_1_2_13_1-bb"><span class="identifier">make</span></a><span class="special">(</span><span class="identifier">A</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">...</span><span class="special">)</span><span class="special">;</span>

  <span class="comment">// <a class="link" href="expr.html#id-1_3_32_5_9_1_1_2_14-bb">public member functions</a></span>
  <span class="identifier">expr</span> <span class="special">&amp;</span> <a class="link" href="expr.html#id-1_3_32_5_9_1_1_2_14_1-bb"><span class="identifier">proto_base</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  <span class="identifier">expr</span> <span class="keyword">const</span> <span class="special">&amp;</span> <a class="link" href="expr.html#id-1_3_32_5_9_1_1_2_14_2-bb"><span class="identifier">proto_base</span></a><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> A<span class="special">&gt;</span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a class="link" href="expr.html#id-1_3_32_5_9_1_1_2_14_3-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="identifier">A</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> A<span class="special">&gt;</span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a class="link" href="expr.html#id-1_3_32_5_9_1_1_2_14_4-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="identifier">A</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> A<span class="special">&gt;</span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a class="link" href="expr.html#id-1_3_32_5_9_1_1_2_14_5-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="identifier">A</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> A<span class="special">&gt;</span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a class="link" href="expr.html#id-1_3_32_5_9_1_1_2_14_6-bb"><span class="keyword">operator</span><span class="special">=</span></a><span class="special">(</span><span class="identifier">A</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> A<span class="special">&gt;</span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a class="link" href="expr.html#id-1_3_32_5_9_1_1_2_14_7-bb"><span class="keyword">operator</span><span class="special">[</span><span class="special">]</span></a><span class="special">(</span><span class="identifier">A</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> A<span class="special">&gt;</span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a class="link" href="expr.html#id-1_3_32_5_9_1_1_2_14_8-bb"><span class="keyword">operator</span><span class="special">[</span><span class="special">]</span></a><span class="special">(</span><span class="identifier">A</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> A<span class="special">&gt;</span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a class="link" href="expr.html#id-1_3_32_5_9_1_1_2_14_9-bb"><span class="keyword">operator</span><span class="special">[</span><span class="special">]</span></a><span class="special">(</span><span class="identifier">A</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> A<span class="special">&gt;</span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a class="link" href="expr.html#id-1_3_32_5_9_1_1_2_14_10-bb"><span class="keyword">operator</span><span class="special">[</span><span class="special">]</span></a><span class="special">(</span><span class="identifier">A</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span><span class="special">...</span> A<span class="special">&gt;</span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a class="link" href="expr.html#id-1_3_32_5_9_1_1_2_14_11-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">A</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">...</span><span class="special">)</span><span class="special">;</span>
  <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span><span class="special">...</span> A<span class="special">&gt;</span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a class="link" href="expr.html#id-1_3_32_5_9_1_1_2_14_12-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">A</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">...</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>

  <span class="comment">// public data members</span>
  <span class="identifier">proto_child</span><em class="replaceable"><code><span class="identifier">N</span></code></em> <span class="identifier">childN</span><span class="special">;</span>  <span class="comment">// For each <em class="replaceable"><code>N</code></em> in <em class="replaceable"><code>[0,max(Arity,1))</code></em>.</span>
  <span class="keyword">static</span> <span class="keyword">const</span> <span class="keyword">long</span> <span class="identifier">proto_arity_c</span><span class="special">;</span>  <span class="comment">// <code class="computeroutput">= Arity;</code></span>
<span class="special">}</span><span class="special">;</span></pre></div>
<div class="refsect1">
<a name="id-1.3.32.5.11.4.4"></a><h2>Description</h2>
<p>
            <code class="computeroutput">proto::expr&lt;&gt;</code> is a node in an expression
            template tree. It is a container for its child sub-trees. It also serves as the
            terminal nodes of the tree.
          </p>
<p>
            <code class="computeroutput">Tag</code> is type that represents the operation
            encoded by this expression. It is typically one of the structs in the
            <code class="computeroutput">boost::proto::tag</code> namespace, but it doesn't
            have to be. If <code class="computeroutput">Arity</code> is 0 then this
            <code class="computeroutput">expr&lt;&gt;</code> type represents a leaf in the
            expression tree.
          </p>
<p>
            <code class="computeroutput">Args</code> is a list of types representing
            the children of this expression. It is an instantiation of one of
            <code class="computeroutput"><a class="link" href="listN.html" title="Struct template listN">proto::list1&lt;&gt;</a></code>,
            <code class="computeroutput"><a class="link" href="listN.html" title="Struct template listN">proto::list2&lt;&gt;</a></code>,
            etc. The child types
            must all themselves be either <code class="computeroutput">proto::expr&lt;&gt;</code>
            or <code class="computeroutput">proto::basic_expr&lt;&gt;&amp;</code> (or extensions thereof via
            <code class="computeroutput"><a class="link" href="extends.html" title="Struct template extends">proto::extends&lt;&gt;</a></code> or
            <code class="computeroutput"><a class="link" href="../../BOOST_PROTO_EXTENDS.html" title="Macro BOOST_PROTO_EXTENDS">BOOST_PROTO_EXTENDS</a>()</code>), unless
            <code class="computeroutput">Arity</code> is 0, in which case
            <code class="computeroutput">Args</code> must be
            <code class="computeroutput">proto::term&lt;T&gt;</code>, where
            <code class="computeroutput">T</code> can be any type.
          </p>
<p>
            <code class="computeroutput">proto::expr&lt;&gt;</code> is a valid Fusion
            random-access sequence, where the elements of the sequence are the child
            expressions.
          </p>
<div class="refsect2">
<a name="id-1.3.32.5.11.4.4.6"></a><h3>
<a name="id-1_3_32_5_9_1_1_2_13-bb"></a><code class="computeroutput">expr</code> public static functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span><span class="special">...</span> A<span class="special">&gt;</span> <span class="keyword">static</span> <span class="identifier">expr</span> <span class="keyword">const</span> <a name="id-1_3_32_5_9_1_1_2_13_1-bb"></a><span class="identifier">make</span><span class="special">(</span><span class="identifier">A</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">...</span> a<span class="special">)</span><span class="special">;</span></pre>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody>
<tr>
<td><p><span class="term">Requires:</span></p></td>
<td><p>
                The number of supplied arguments must be <code class="computeroutput">max(Arity,1)</code>.
              </p></td>
</tr>
<tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>
                A new <code class="computeroutput">expr</code> object initialized with the specified arguments.
              </p></td>
</tr>
</tbody>
</table></div>
</li></ol></div>
</div>
<div class="refsect2">
<a name="id-1.3.32.5.11.4.4.7"></a><h3>
<a name="id-1_3_32_5_9_1_1_2_14-bb"></a><code class="computeroutput">expr</code> public member functions</h3>
<div class="orderedlist"><ol class="orderedlist" type="1">
<li class="listitem">
<pre class="literallayout"><span class="identifier">expr</span> <span class="special">&amp;</span> <a name="id-1_3_32_5_9_1_1_2_14_1-bb"></a><span class="identifier">proto_base</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p><code class="computeroutput">*this</code></p></td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="identifier">expr</span> <span class="keyword">const</span> <span class="special">&amp;</span> <a name="id-1_3_32_5_9_1_1_2_14_2-bb"></a><span class="identifier">proto_base</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>This is an overloaded member function, provided for convenience. It differs from
              the above function only in what argument(s) it accepts.</p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> A<span class="special">&gt;</span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a name="id-1_3_32_5_9_1_1_2_14_3-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><span class="identifier">A</span> <span class="special">&amp;</span> a<span class="special">)</span><span class="special">;</span></pre>
<p>Lazy assignment expression</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>A new expression node representing the assignment operation.</p></td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> A<span class="special">&gt;</span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a name="id-1_3_32_5_9_1_1_2_14_4-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><span class="identifier">A</span> <span class="keyword">const</span> <span class="special">&amp;</span> a<span class="special">)</span><span class="special">;</span></pre>
<p>
                This is an overloaded member function, provided for convenience. It differs from
                the above function only in what argument(s) it accepts.
              </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> A<span class="special">&gt;</span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a name="id-1_3_32_5_9_1_1_2_14_5-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><span class="identifier">A</span> <span class="special">&amp;</span> a<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>
                This is an overloaded member function, provided for convenience. It differs from
                the above function only in what argument(s) it accepts.
              </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> A<span class="special">&gt;</span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a name="id-1_3_32_5_9_1_1_2_14_6-bb"></a><span class="keyword">operator</span><span class="special">=</span><span class="special">(</span><span class="identifier">A</span> <span class="keyword">const</span> <span class="special">&amp;</span> a<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>
                This is an overloaded member function, provided for convenience. It differs from
                the above function only in what argument(s) it accepts.
              </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> A<span class="special">&gt;</span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a name="id-1_3_32_5_9_1_1_2_14_7-bb"></a><span class="keyword">operator</span><span class="special">[</span><span class="special">]</span><span class="special">(</span><span class="identifier">A</span> <span class="special">&amp;</span> a<span class="special">)</span><span class="special">;</span></pre>
<p>Lazy subscript expression</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>A new expression node representing the subscript operation.</p></td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> A<span class="special">&gt;</span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a name="id-1_3_32_5_9_1_1_2_14_8-bb"></a><span class="keyword">operator</span><span class="special">[</span><span class="special">]</span><span class="special">(</span><span class="identifier">A</span> <span class="keyword">const</span> <span class="special">&amp;</span> a<span class="special">)</span><span class="special">;</span></pre>
<p>
                This is an overloaded member function, provided for convenience. It differs from
                the above function only in what argument(s) it accepts.
              </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> A<span class="special">&gt;</span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a name="id-1_3_32_5_9_1_1_2_14_9-bb"></a><span class="keyword">operator</span><span class="special">[</span><span class="special">]</span><span class="special">(</span><span class="identifier">A</span> <span class="special">&amp;</span> a<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>
                This is an overloaded member function, provided for convenience. It differs from
                the above function only in what argument(s) it accepts.
              </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> A<span class="special">&gt;</span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a name="id-1_3_32_5_9_1_1_2_14_10-bb"></a><span class="keyword">operator</span><span class="special">[</span><span class="special">]</span><span class="special">(</span><span class="identifier">A</span> <span class="keyword">const</span> <span class="special">&amp;</span> a<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>
                This is an overloaded member function, provided for convenience. It differs from
                the above function only in what argument(s) it accepts.
              </p>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span><span class="special">...</span> A<span class="special">&gt;</span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a name="id-1_3_32_5_9_1_1_2_14_11-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">A</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">...</span> a<span class="special">)</span><span class="special">;</span></pre>
<p>Lazy function call</p>
<div class="variablelist"><table border="0" class="variablelist compact">
<colgroup>
<col align="left" valign="top">
<col>
</colgroup>
<tbody><tr>
<td><p><span class="term">Returns:</span></p></td>
<td><p>A new expression node representing the function call operation.</p></td>
</tr></tbody>
</table></div>
</li>
<li class="listitem">
<pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span><span class="special">...</span> A<span class="special">&gt;</span> <em class="replaceable"><code><span class="identifier">unspecified</span></code></em> <a name="id-1_3_32_5_9_1_1_2_14_12-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">A</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">...</span> a<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
<p>
                This is an overloaded member function, provided for convenience. It differs from
                the above function only in what argument(s) it accepts.
              </p>
</li>
</ol></div>
</div>
</div>
</div>
<div class="copyright-footer">Copyright © 2008 Eric Niebler<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
      </p>
</div>
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